(а + b + c)/ 3 = - 28
a + b + c = -84
a = 2.5 b
b = 1.5 c => c = 2b/3
2.5b + b + 2b/3 = -84
25b/6 = -84
b = -20.16
a = -50.4
c = -13.44
(а + b + c)/ 3 = - 28
a + b + c = -84
a = 2.5 b
b = 1.5 c => c = 2b/3
2.5b + b + 2b/3 = -84
25b/6 = -84
b = -20.16
a = -50.4
c = -13.44